ICD-10 Code I70.549 – Atherosclerosis of nonautologous biological bypass graft(s) of the left leg with ulceration of unspecified site (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.549 – Atherosclerosis of nonautologous biological bypass graft(s) of the left leg with ulceration of unspecified site
What it is
This code identifies narrowing or blockage from atherosclerosis in a nonautologous biological bypass graft in the left leg, with an associated ulcer at an unspecified site. Use it when the graft itself is the affected vessel and ulceration is documented.
Clinical signs
Typical findings may include reduced leg perfusion, diminished pulses, pain, or poor wound healing. Clinical features vary; refer to documentation, especially for the ulcer location and whether the graft is the source of the arterial disease.
When to use this code
Use this code when the record clearly states atherosclerosis involving a nonautologous biological bypass graft in the left leg and an ulcer is present, but the ulcer site is not further specified. You should confirm laterality and graft type in the operative or vascular note. If the ulcer site is documented more precisely, code that detail instead.
Do not use for
Do not use this code for native artery atherosclerosis, graft infection, or ulcers unrelated to the bypass graft disease. Check documentation if the ulcer is on a different site or if laterality is not left.
Coding tip
Verify three elements together: left leg, nonautologous biological graft, and ulceration with unspecified site.